focuses faster on oly bodies (I've only osed on EP3 and EM5) than the 20/1.7. Corners a tad soft up to F4, OK from there. Focus at larger apertures (F2 and below) seems more accurate on EM5 than on EP3, but having just got the lens only done a few quick shots with both bodies. There is a touch of distortion but not enough to be of concern.
Good assessment. I'd say I'm actually pretty impressed for ISO 6400. Can't wait to try this baby out at ISO 200.